MN Arrowhead Invasive Plant Phenology and Control Calendar Cook and Lake County Invasives Teams MDA Noxious Weeds Jan Feb Mar April May June July Aug Sept Oct Nov Dec Buckthorn, Glossy Buckthorn, Common Foliar applications target rosettes. Knapweed, Spotted Mowing is not advised Knotweed, Japanese or giant Cut stem or inject - treat during active growth periods. Not recommended without additional treatments. Mow 2x at 3' in fall. Loosestrife, Purple Best before flower Mustard, Garlic Parsnip, Wild CAUTION: Can cause a dermatitus Reed, Common Rose, Multiflora Mow 3-6x/season for 2-4 years Spurge, Leafy Best before flowering Tansy, Common Thistle, Canada Begin at 3' tall Thistle, Plumeless Fire is not effective at killing the below ground rhizomes. Result is a likely increase in stem count after burns. Toadflax, Dalmatian Mowing can prevent seed production, but forces vegetative reproduction. Therefore, monitor and repeat during the season. Burn Mow Herbicide: Foliar Do Not Mow Herbicide: Stem or Stump Approximate Bloom Note: Suggested timings are approximate since weather and seasonal variations play a role in deciding how and when to control an infestation. Hand Pull/Dig Adapted from MnDOT Minnesota Noxious Weed Guide (2014) MN Arrowhead Invasive Plant Phenology and Control Calendar Cook and Lake County Invasives Teams Other Invasive Plants Jan Feb Mar April May June July Aug Sept Oct Nov Dec Barberry, Japanese Bugloss, Viper's Daisy, Oxeye Grass, Reed Canary Target rosettes Mowing is not recommended Hawkweed, Orange Target rosettes Lupine Mowing stimulates new growth and spreads seeds Nettle, Hemp Sow-thistle, Perennial St. John's Wort Sweetclover, White or Yellow Most effective after flowering, prior to seeding Target rosette Thistle, Bull Trefoil, Birdsfoot Burn Mow Herbicide: Foliar Do Not Mow Herbicide: Stem or Stump Approximate Bloom Note: Suggested timings are approximate since weather and seasonal variations play a role in deciding how and when to control an infestation. Hand Pull/Dig Adapted from MnDOT Minnesota Noxious Weed Guide (2014)
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